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2 November, 16:13

The pressure at the center of the earth is probably greater than 3x106 atm, and the temperature there is about 4000 °C. What is the change in the Gibbs function of reaction on going from crust to core for a reaction in which  Vm = 1 cm3 mol-1 and  Sm = 2.1 J K-1 mol-1

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  1. 2 November, 16:30
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    The change in the Gibbs function of reaction on going from crust to core, dG=291442.4 J/mol

    Explanation:

    dG=vdp-sdT

    Where T is the temperature.

    P is the pressure.

    S is entropy

    V = 1cm3 = 10-6 m3

    P = 3*10∧6 atm = 3*10∧11 pa

    The temperature at the center of the earth, Tc = 4*103 °C. : The temperature at the sufrace (crust) of the earth, Ts = 298K.

    Subistuting the values

    dG = (10-6 * (3*1011-105) - (2.1 (4373-298))

    dG=291442.4 J/mol.
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